By Ken Parsons
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Additional info for Human Thermal Environments: The Effects of Hot, Moderate, and Cold Environments on Human Health, Comfort and Performance, Second Edition
3 mbl is in Lh−1 m−2 limited from 90Lh−1 m−2 to 3Lh−1 m−2. This simple two-node model demonstrates the ‘average’ change in the thermal properties of tissues with blood flow. It is important to recognize that this is a simplification. In the human body there is much variation across the body, and there are confounding factors. For example, in exercise or shivering, blood flow is increased even when ‘attempting’ to preserve heat. Burton and Bazett (1936) for example show that greatest tissue resistance varies under cool conditions: for cold conditions shivering causes blood flow, which decreases resistance.
Although sweating required in a hot environment is used in the example, requirements for other components can also be calculated: for example, in terms of metabolic rate, air velocity, or the insulation of clothing. The conceptual basis for the body heat balance equation is well established. However, equations for components of the equation are continually updated from the results of research. Of particular importance has been the theory of heat transfer. Much of the development of the heat balance equation for the human body has been adapted from heat (and mass) transfer theory.
It can be seen that the controlling system involves both integration of a number of sensor signals from individual sources and ‘cross over’ inhibitory connections. Details of how thermosensors relate to effectors and the inclusion of multiple sensors of temperature distribution governed by passive and controlled heat exchange, storage and generation mechanisms, and including counter-current exchange would lead to a numerical model which could be represented in dynamic form on a digital computer.